sfc: Reschedule any resets scheduled inside efx_pm_freeze()

efx_pm_freeze() sets efx->state = STATE_FINI, which means
efx_reset_work() will abort any scheduled resets.

efx_pm_thaw() should reschedule efx_reset_work() again,
since a freeze/thaw will not have reset the hardware.

This bug was spotted by inspection - there is no real world example of
this happening.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/sfc/efx.c

@@ -1886,6 +1886,9 @@ static void efx_reset_work(struct work_struct *data)
 {
 	struct efx_nic *efx = container_of(data, struct efx_nic, reset_work);
 
+	if (efx->reset_pending == RESET_TYPE_NONE)
+		return;
+
 	/* If we're not RUNNING then don't reset. Leave the reset_pending
 	 * flag set so that efx_pci_probe_main will be retried */
 	if (efx->state != STATE_RUNNING) {
@@ -2332,6 +2335,9 @@ static int efx_pm_thaw(struct device *dev)
 
 	efx->type->resume_wol(efx);
 
+	/* Reschedule any quenched resets scheduled during efx_pm_freeze() */
+	queue_work(reset_workqueue, &efx->reset_work);
+
 	return 0;
 }